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The upgrade is started using java -jar wls1036_upgrade_generic.jar command.
Correction. It is the file wlfileio3.dll that is held by another process...
Were you ever able to figure this out? I am having the same issue.
It seems that you are upgrading the 64 bit on windows.
where as following .dll " wlfileio.dll" seems to be corrupt.
Check under %BEA_Home% / server / bin / 64bit/
check for the .dll file whether have size or not if it is zero size then it is corrupted. then try to replace it frm 32 bit and check again.